Heater



FIG. 1 is a front perspective view of a heater according to the invention.

FIG. 2 is a front view of the heater of FIG. 1.

FIG. 3 is a rear view of the heater of FIG. 1.

FIG. 4 is a right side view of the heater of FIG. 1.

FIG. 5 is a left side view of the heater of FIG. 1.

FIG. 6 is a top plan view of the heater of FIG. 1; and,

FIG. 7 is a bottom plan view of the heater of FIG. 1.

The broken lines illustrate portions of the heater and form no part of the claimed design. 

CLAIM The ornamental design for a heater, as shown and described. 